a parameterized route can map [foo] onto itself (#1767)

* a parameterized route can map [foo] onto itself

* isParameterized; lift test

---------

Co-authored-by: Mike Bostock <[email protected]>

Author: Fil

src/route.ts

@@ -62,11 +62,13 @@ function routeParams(root: string, cwd: string, parts: string[], exts: string[])
       return;
     case 1: {
       const [first] = parts;
-      for (const ext of exts) {
-        const path = join(root, cwd, first + ext);
-        if (existsSync(path)) {
-          if (!statSync(path).isFile()) return; // ignore non-files
-          return {path: join(cwd, first + ext), ext};
+      if (!isParameterized(first)) {
+        for (const ext of exts) {
+          const path = join(root, cwd, first + ext);
+          if (existsSync(path)) {
+            if (!statSync(path).isFile()) return; // ignore non-files
+            return {path: join(cwd, first + ext), ext};
+          }
         }
       }
       if (first) {
@@ -84,8 +86,10 @@ function routeParams(root: string, cwd: string, parts: string[], exts: string[])
       const path = join(root, cwd, first);
       if (existsSync(path)) {
         if (!statSync(path).isDirectory()) return; // ignore non-directories
-        const found = routeParams(root, join(cwd, first), rest, exts);
-        if (found) return found;
+        if (!isParameterized(first)) {
+          const found = routeParams(root, join(cwd, first), rest, exts);
+          if (found) return found;
+        }
       }
       if (first) {
         for (const dir of globSync("*\\[?*\\]*/", {cwd: join(root, cwd)})) {

test/route-test.ts

@@ -47,6 +47,14 @@ describe("route(root, path, exts)", () => {
   it("finds a non-parameterized file ahead of a parameterized file", () => {
     assert.deepStrictEqual(route("test/input/params", "foo", [".md"]), {path: "foo.md", ext: ".md"}); // prettier-ignore
   });
+  it("maps a bracketed parameter onto itself", () => {
+    assert.deepStrictEqual(route("test/input/params", "[dir]/[file]", [".md"]), {path: "[dir]/[file].md", ext: ".md", params: {dir: "[dir]", file: "[file]"}}); // prettier-ignore
+    assert.deepStrictEqual(route("test/input/params", "[dir]/foo", [".md"]), {path: "[dir]/foo.md", ext: ".md", params: {dir: "[dir]"}}); // prettier-ignore
+    assert.deepStrictEqual(route("test/input/params", "[dir]/[baz]", [".md"]), {path: "[dir]/[file].md", ext: ".md", params: {dir: "[dir]", file: "[baz]"}}); // prettier-ignore
+    assert.deepStrictEqual(route("test/input/params", "foo/[file]", [".md"]), {path: "foo/[file].md", ext: ".md", params: {file: "[file]"}}); // prettier-ignore
+    assert.deepStrictEqual(route("test/input/params", "[foo]-suffix", [".js"]), {path: "[file]-suffix.js", ext: ".js", params: {file: "[foo]"}}); // prettier-ignore
+    assert.deepStrictEqual(route("test/input/params", "[file]-suffix", [".js"]), {path: "[file]-suffix.js", ext: ".js", params: {file: "[file]"}}); // prettier-ignore
+  });
   it("finds the most-specific parameterized match", () => {
     assert.deepStrictEqual(route("test/input/params", "foo/foo", [".md"]), {path: "foo/foo.md", ext: ".md"}); // prettier-ignore
     assert.deepStrictEqual(route("test/input/params", "foo/bar", [".md"]), {path: "foo/[file].md", ext: ".md", params: {file: "bar"}}); // prettier-ignore